/Engine/Plugins/Media/PixelStreaming/Source/PixelStreaming/Public/PixelStreamingDelegates.h
C++ Delegate.
typedef TMulticastDelegate_ThreeParams< void, [FString](API\Runtime\Core\Containers\FString), [FPixelStreamingPlayerId](API\Plugins\PixelStreaming\FPixelStreamingPlayerId), bool > FNewConnectionNative